12874c5fdSThomas Gleixner // SPDX-License-Identifier: GPL-2.0-or-later
284c99db8SAshish Jangam /*
384c99db8SAshish Jangam * I2C access for DA9052 PMICs.
484c99db8SAshish Jangam *
584c99db8SAshish Jangam * Copyright(c) 2011 Dialog Semiconductor Ltd.
684c99db8SAshish Jangam *
784c99db8SAshish Jangam * Author: David Dajun Chen <dchen@diasemi.com>
884c99db8SAshish Jangam */
984c99db8SAshish Jangam
1084c99db8SAshish Jangam #include <linux/device.h>
1184c99db8SAshish Jangam #include <linux/module.h>
1284c99db8SAshish Jangam #include <linux/input.h>
1384c99db8SAshish Jangam #include <linux/mfd/core.h>
1484c99db8SAshish Jangam #include <linux/i2c.h>
1584c99db8SAshish Jangam #include <linux/err.h>
16*dc0c386eSRob Herring #include <linux/of.h>
1784c99db8SAshish Jangam
1884c99db8SAshish Jangam #include <linux/mfd/da9052/da9052.h>
1984c99db8SAshish Jangam #include <linux/mfd/da9052/reg.h>
2084c99db8SAshish Jangam
2158d114b6SYing-Chun Liu (PaulLiu)
220a8c290aSAshish Jangam /* I2C safe register check */
i2c_safe_reg(unsigned char reg)230a8c290aSAshish Jangam static inline bool i2c_safe_reg(unsigned char reg)
240a8c290aSAshish Jangam {
250a8c290aSAshish Jangam switch (reg) {
260a8c290aSAshish Jangam case DA9052_STATUS_A_REG:
270a8c290aSAshish Jangam case DA9052_STATUS_B_REG:
280a8c290aSAshish Jangam case DA9052_STATUS_C_REG:
290a8c290aSAshish Jangam case DA9052_STATUS_D_REG:
300a8c290aSAshish Jangam case DA9052_ADC_RES_L_REG:
310a8c290aSAshish Jangam case DA9052_ADC_RES_H_REG:
320a8c290aSAshish Jangam case DA9052_VDD_RES_REG:
330a8c290aSAshish Jangam case DA9052_ICHG_AV_REG:
340a8c290aSAshish Jangam case DA9052_TBAT_RES_REG:
350a8c290aSAshish Jangam case DA9052_ADCIN4_RES_REG:
360a8c290aSAshish Jangam case DA9052_ADCIN5_RES_REG:
370a8c290aSAshish Jangam case DA9052_ADCIN6_RES_REG:
380a8c290aSAshish Jangam case DA9052_TJUNC_RES_REG:
390a8c290aSAshish Jangam case DA9052_TSI_X_MSB_REG:
400a8c290aSAshish Jangam case DA9052_TSI_Y_MSB_REG:
410a8c290aSAshish Jangam case DA9052_TSI_LSB_REG:
420a8c290aSAshish Jangam case DA9052_TSI_Z_MSB_REG:
430a8c290aSAshish Jangam return true;
440a8c290aSAshish Jangam default:
450a8c290aSAshish Jangam return false;
460a8c290aSAshish Jangam }
470a8c290aSAshish Jangam }
480a8c290aSAshish Jangam
490a8c290aSAshish Jangam /*
500a8c290aSAshish Jangam * There is an issue with DA9052 and DA9053_AA/BA/BB PMIC where the PMIC
510a8c290aSAshish Jangam * gets lockup up or fails to respond following a system reset.
520a8c290aSAshish Jangam * This fix is to follow any read or write with a dummy read to a safe
530a8c290aSAshish Jangam * register.
540a8c290aSAshish Jangam */
da9052_i2c_fix(struct da9052 * da9052,unsigned char reg)55c3e9e6b6SFabio Estevam static int da9052_i2c_fix(struct da9052 *da9052, unsigned char reg)
560a8c290aSAshish Jangam {
570a8c290aSAshish Jangam int val;
580a8c290aSAshish Jangam
590a8c290aSAshish Jangam switch (da9052->chip_id) {
600a8c290aSAshish Jangam case DA9052:
610a8c290aSAshish Jangam case DA9053_AA:
620a8c290aSAshish Jangam case DA9053_BA:
630a8c290aSAshish Jangam case DA9053_BB:
640a8c290aSAshish Jangam /* A dummy read to a safe register address. */
650a8c290aSAshish Jangam if (!i2c_safe_reg(reg))
660a8c290aSAshish Jangam return regmap_read(da9052->regmap,
670a8c290aSAshish Jangam DA9052_PARK_REGISTER,
680a8c290aSAshish Jangam &val);
690a8c290aSAshish Jangam break;
706c049b2aSOpensource [Anthony Olech] case DA9053_BC:
710a8c290aSAshish Jangam default:
720a8c290aSAshish Jangam /*
730a8c290aSAshish Jangam * For other chips parking of I2C register
740a8c290aSAshish Jangam * to a safe place is not required.
750a8c290aSAshish Jangam */
760a8c290aSAshish Jangam break;
770a8c290aSAshish Jangam }
780a8c290aSAshish Jangam
790a8c290aSAshish Jangam return 0;
800a8c290aSAshish Jangam }
810a8c290aSAshish Jangam
8243e30f23SDavid Jander /*
8343e30f23SDavid Jander * According to errata item 24, multiwrite mode should be avoided
8443e30f23SDavid Jander * in order to prevent register data corruption after power-down.
8543e30f23SDavid Jander */
da9052_i2c_disable_multiwrite(struct da9052 * da9052)8643e30f23SDavid Jander static int da9052_i2c_disable_multiwrite(struct da9052 *da9052)
8784c99db8SAshish Jangam {
8884c99db8SAshish Jangam int reg_val, ret;
8984c99db8SAshish Jangam
9084c99db8SAshish Jangam ret = regmap_read(da9052->regmap, DA9052_CONTROL_B_REG, ®_val);
9184c99db8SAshish Jangam if (ret < 0)
9284c99db8SAshish Jangam return ret;
9384c99db8SAshish Jangam
9443e30f23SDavid Jander if (!(reg_val & DA9052_CONTROL_B_WRITEMODE)) {
9543e30f23SDavid Jander reg_val |= DA9052_CONTROL_B_WRITEMODE;
9684c99db8SAshish Jangam ret = regmap_write(da9052->regmap, DA9052_CONTROL_B_REG,
9784c99db8SAshish Jangam reg_val);
9884c99db8SAshish Jangam if (ret < 0)
9984c99db8SAshish Jangam return ret;
10084c99db8SAshish Jangam }
10184c99db8SAshish Jangam
10284c99db8SAshish Jangam return 0;
10384c99db8SAshish Jangam }
10484c99db8SAshish Jangam
105e27d650bSArnd Bergmann static const struct i2c_device_id da9052_i2c_id[] = {
10658d114b6SYing-Chun Liu (PaulLiu) {"da9052", DA9052},
10758d114b6SYing-Chun Liu (PaulLiu) {"da9053-aa", DA9053_AA},
10858d114b6SYing-Chun Liu (PaulLiu) {"da9053-ba", DA9053_BA},
10958d114b6SYing-Chun Liu (PaulLiu) {"da9053-bb", DA9053_BB},
1106c049b2aSOpensource [Anthony Olech] {"da9053-bc", DA9053_BC},
11158d114b6SYing-Chun Liu (PaulLiu) {}
11258d114b6SYing-Chun Liu (PaulLiu) };
1134700ef32SZou Wei MODULE_DEVICE_TABLE(i2c, da9052_i2c_id);
11458d114b6SYing-Chun Liu (PaulLiu)
11558d114b6SYing-Chun Liu (PaulLiu) #ifdef CONFIG_OF
11658d114b6SYing-Chun Liu (PaulLiu) static const struct of_device_id dialog_dt_ids[] = {
11758d114b6SYing-Chun Liu (PaulLiu) { .compatible = "dlg,da9052", .data = &da9052_i2c_id[0] },
11858d114b6SYing-Chun Liu (PaulLiu) { .compatible = "dlg,da9053-aa", .data = &da9052_i2c_id[1] },
1196c049b2aSOpensource [Anthony Olech] { .compatible = "dlg,da9053-ba", .data = &da9052_i2c_id[2] },
12058d114b6SYing-Chun Liu (PaulLiu) { .compatible = "dlg,da9053-bb", .data = &da9052_i2c_id[3] },
1216c049b2aSOpensource [Anthony Olech] { .compatible = "dlg,da9053-bc", .data = &da9052_i2c_id[4] },
12258d114b6SYing-Chun Liu (PaulLiu) { /* sentinel */ }
12358d114b6SYing-Chun Liu (PaulLiu) };
12458d114b6SYing-Chun Liu (PaulLiu) #endif
12558d114b6SYing-Chun Liu (PaulLiu)
da9052_i2c_probe(struct i2c_client * client)1261ebf7972SUwe Kleine-König static int da9052_i2c_probe(struct i2c_client *client)
12784c99db8SAshish Jangam {
1281ebf7972SUwe Kleine-König const struct i2c_device_id *id = i2c_client_get_device_id(client);
12984c99db8SAshish Jangam struct da9052 *da9052;
13084c99db8SAshish Jangam int ret;
13184c99db8SAshish Jangam
1326608a5e2SAxel Lin da9052 = devm_kzalloc(&client->dev, sizeof(struct da9052), GFP_KERNEL);
13384c99db8SAshish Jangam if (!da9052)
13484c99db8SAshish Jangam return -ENOMEM;
13584c99db8SAshish Jangam
13684c99db8SAshish Jangam da9052->dev = &client->dev;
13784c99db8SAshish Jangam da9052->chip_irq = client->irq;
1380a8c290aSAshish Jangam da9052->fix_io = da9052_i2c_fix;
13984c99db8SAshish Jangam
14084c99db8SAshish Jangam i2c_set_clientdata(client, da9052);
14184c99db8SAshish Jangam
1426608a5e2SAxel Lin da9052->regmap = devm_regmap_init_i2c(client, &da9052_regmap_config);
14384c99db8SAshish Jangam if (IS_ERR(da9052->regmap)) {
14484c99db8SAshish Jangam ret = PTR_ERR(da9052->regmap);
14584c99db8SAshish Jangam dev_err(&client->dev, "Failed to allocate register map: %d\n",
14684c99db8SAshish Jangam ret);
1476608a5e2SAxel Lin return ret;
14884c99db8SAshish Jangam }
14984c99db8SAshish Jangam
15043e30f23SDavid Jander ret = da9052_i2c_disable_multiwrite(da9052);
15184c99db8SAshish Jangam if (ret < 0)
1526608a5e2SAxel Lin return ret;
15384c99db8SAshish Jangam
15458d114b6SYing-Chun Liu (PaulLiu) #ifdef CONFIG_OF
1558b201402SKrzysztof Kozlowski if (!id)
1568b201402SKrzysztof Kozlowski id = of_device_get_match_data(&client->dev);
15758d114b6SYing-Chun Liu (PaulLiu) #endif
15858d114b6SYing-Chun Liu (PaulLiu)
15958d114b6SYing-Chun Liu (PaulLiu) if (!id) {
16058d114b6SYing-Chun Liu (PaulLiu) ret = -ENODEV;
16158d114b6SYing-Chun Liu (PaulLiu) dev_err(&client->dev, "id is null.\n");
1626608a5e2SAxel Lin return ret;
16358d114b6SYing-Chun Liu (PaulLiu) }
16458d114b6SYing-Chun Liu (PaulLiu)
165ad698ea4SJavier Martinez Canillas return da9052_device_init(da9052, id->driver_data);
16684c99db8SAshish Jangam }
16784c99db8SAshish Jangam
da9052_i2c_remove(struct i2c_client * client)168ed5c2f5fSUwe Kleine-König static void da9052_i2c_remove(struct i2c_client *client)
16984c99db8SAshish Jangam {
17084c99db8SAshish Jangam struct da9052 *da9052 = i2c_get_clientdata(client);
17184c99db8SAshish Jangam
17284c99db8SAshish Jangam da9052_device_exit(da9052);
17384c99db8SAshish Jangam }
17484c99db8SAshish Jangam
17584c99db8SAshish Jangam static struct i2c_driver da9052_i2c_driver = {
1769816d859SUwe Kleine-König .probe = da9052_i2c_probe,
17784449216SBill Pemberton .remove = da9052_i2c_remove,
17884c99db8SAshish Jangam .id_table = da9052_i2c_id,
17984c99db8SAshish Jangam .driver = {
18084c99db8SAshish Jangam .name = "da9052",
18158d114b6SYing-Chun Liu (PaulLiu) #ifdef CONFIG_OF
18258d114b6SYing-Chun Liu (PaulLiu) .of_match_table = dialog_dt_ids,
18358d114b6SYing-Chun Liu (PaulLiu) #endif
18484c99db8SAshish Jangam },
18584c99db8SAshish Jangam };
18684c99db8SAshish Jangam
da9052_i2c_init(void)18784c99db8SAshish Jangam static int __init da9052_i2c_init(void)
18884c99db8SAshish Jangam {
18984c99db8SAshish Jangam int ret;
19084c99db8SAshish Jangam
19184c99db8SAshish Jangam ret = i2c_add_driver(&da9052_i2c_driver);
19284c99db8SAshish Jangam if (ret != 0) {
19384c99db8SAshish Jangam pr_err("DA9052 I2C registration failed %d\n", ret);
19484c99db8SAshish Jangam return ret;
19584c99db8SAshish Jangam }
19684c99db8SAshish Jangam
19784c99db8SAshish Jangam return 0;
19884c99db8SAshish Jangam }
19984c99db8SAshish Jangam subsys_initcall(da9052_i2c_init);
20084c99db8SAshish Jangam
da9052_i2c_exit(void)20184c99db8SAshish Jangam static void __exit da9052_i2c_exit(void)
20284c99db8SAshish Jangam {
20384c99db8SAshish Jangam i2c_del_driver(&da9052_i2c_driver);
20484c99db8SAshish Jangam }
20584c99db8SAshish Jangam module_exit(da9052_i2c_exit);
20684c99db8SAshish Jangam
20784c99db8SAshish Jangam MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
20884c99db8SAshish Jangam MODULE_DESCRIPTION("I2C driver for Dialog DA9052 PMIC");
209